The Brooklyn Orthodox man brutally murdered in Colombia was reeling from the end of his one-month marriage to a teen bride — and was desperately looking for a new love when he was killed. The body of Nachum Israel Eber was found dismembered inside a bloody wardrobe that was dumped on a street in Bogota on Sunday. Yosef Matheron, a Colombian man who befriended Eber and helped translate for him, told The Post how Eber had met his 18-year-old wife before the brief union unraveled in January. Eber,